Elucidating the Origin of Enhanced Phosphorescence Emission in the Solid State (EPESS) in Cyclometallated Iridium Complexes

Elucidating the Origin of Enhanced Phosphorescence Emission in the Solid State (EPESS) in Cyclometallated Iridium Complexes

Title

Elucidating the Origin of Enhanced Phosphorescence Emission in the Solid State (EPESS) in Cyclometallated Iridium Complexes

Publication Type

Journal Article

Year of Publication

2014

Authors

Howarth, AJ, Patia, R, Davies, DL, Lelj, F, Wolf, MO, Singh, K

Journal

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY

Pagination

3657-3664

Date Published

AUG

ISSN

1434-1948

Abstract

A new mechanism for enhanced phosphorescence emission in the solid state (EPESS) in cyclometallated Ir complexes with the general formula {[}Ir((CN)-N-boolean AND)(2)((NO)-O-boolean AND)] involving distortion of the six-membered chelate ring of the ancillary ligand is proposed. Photophysical and computational studies show that neither pi-stacking nor restricted rotation cause the observed EPESS in these complexes and that ligand distortions in the triplet excited state are responsible for EPESS